x86: don't span a new worker in __smp_prepare_cpu

We can do it now that do_boot_cpu has its own worker.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/smpboot_32.c

@@ -699,44 +699,18 @@ void cpu_exit_clear(void)
 }
 #endif
 
-struct warm_boot_cpu_info {
-	struct completion *complete;
-	struct work_struct task;
-	int apicid;
-	int cpu;
-};
-
-static void __cpuinit do_warm_boot_cpu(struct work_struct *work)
-{
-	struct warm_boot_cpu_info *info =
-		container_of(work, struct warm_boot_cpu_info, task);
-	do_boot_cpu(info->apicid, info->cpu);
-	complete(info->complete);
-}
-
 static void __cpuinit __smp_prepare_cpu(int cpu)
 {
-	DECLARE_COMPLETION_ONSTACK(done);
-	struct warm_boot_cpu_info info;
 	int	apicid;
 
 	apicid = per_cpu(x86_cpu_to_apicid, cpu);
 
-	info.complete = &done;
-	info.apicid = apicid;
-	info.cpu = cpu;
-	INIT_WORK(&info.task, do_warm_boot_cpu);
-
 	/* init low mem mapping */
 	clone_pgd_range(swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS,
 			min_t(unsigned long, KERNEL_PGD_PTRS, USER_PGD_PTRS));
 	flush_tlb_all();
-	if (!keventd_up() || current_is_keventd())
-		info.task.func(&info.task);
-	else {
-		schedule_work(&info.task);
-		wait_for_completion(&done);
-	}
+
+	do_boot_cpu(apicid, cpu);
 }
 
 static int boot_cpu_logical_apicid;